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Utilise this air con BTU calculator to gauge the cooling requirements of a standard room or house. It allows you to determine the necessary power of an apartment window air conditioner or the capacity of a central air conditioning system for an entire house.

Calculate the BTU's required for your room size

*This guide is an approximate calculation and does not take into account insulation, room shape, ceiling height, direction of sunlight, external temperature and other factors.  For an accurate calculation please complete a quote request, and one of our team will get in touch.

What are BTU's?

The British Thermal Unit, abbreviated as BTU, serves as a unit of energy measurement. It represents the approximate amount of energy required to raise the temperature of one pound of water by one degree Fahrenheit. In alternative units of measurement, 1 BTU is equivalent to 1,055 joules,  0.293 watt-hours. Conversely, 1 watt is approximately equal to 3.412 BTUs per hour.

The BTU unit is commonly employed as a reference point for comparing different fuels. Despite the fact that fuels are typically quantified by volume or barrels as physical commodities, they can be converted to BTUs based on their inherent energy or heat content. Using BTUs as a unit of measurement proves more useful since it reflects the intrinsic value of fuels as energy sources. Consequently, various commodities possessing inherent energy properties, such as natural gas and oil, can be effectively compared and contrasted.

Practically, BTUs can also serve as a point of reference for assessing the heat generated by appliances. The BTU rating of an appliance directly corresponds to its heating capacity, meaning that the higher the BTU rating, the greater the amount of heat it can produce. Concerning residential air conditioning, although the primary purpose of AC units is to cool homes, the BTU measurement on technical labels actually indicates the amount of heat the air conditioner can effectively remove from the surrounding air.


Several factors can affect the output or performance of an air conditioning system. Here are some common conditions that can impact the effectiveness and efficiency of an air conditioner:

Room Size

The size of the room or space being cooled is crucial. An air conditioner that is too small for a room may struggle to provide adequate cooling, while an oversized unit may lead to inefficient operation and excessive energy consumption.

Insulation and Sealing

The insulation of the room or house plays a significant role in maintaining the desired temperature. Poor insulation or gaps in doors, windows, or walls can result in heat infiltration or loss, making it harder for the air conditioner to maintain a comfortable temperature.

Outdoor Temperature

The external temperature can affect the cooling output of an air conditioner. Extremely high temperatures can place a greater load on the unit, potentially reducing its cooling capacity or efficiency.

Airflow and Ventilation

Proper airflow and ventilation are essential for efficient cooling. Restricted airflow due to blocked or dirty air filters, obstructed vents, or inadequate ductwork can diminish the air conditioner's output.

Maintenance and Cleanliness

Regular maintenance and cleaning of the air conditioning unit are vital to ensure optimal performance. Accumulated dirt, dust, or debris on the coils, filters, or fans can obstruct airflow and reduce the system's efficiency.

Age and Condition of the Unit

The age and overall condition of the air conditioning system can impact its output. Older units may have reduced efficiency and cooling capacity compared to newer, more energy-efficient models.

Sunlight Exposure

The amount of sunlight entering the room can influence the cooling requirements. Rooms with direct sunlight exposure may require additional cooling to offset the heat gain from the sun.

Occupancy and Heat Sources

The number of people occupying a space and the presence of heat-generating sources such as appliances, electronics, or lighting can increase the cooling load and impact the air conditioner's output.

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For a comprehensive quote please contact our sales & design team to arrange a free survey.


Looking for affordable air conditioning options for your home? Cold Control offer a selection of leading brand air conditioning systems which are competitively priced to meet your budgetary needs. 

Visit our price guide, or request a custom quote by following the links below.




We will recommend systems based on your facilities, taking into account your interiors, budget and any pre-existing systems in place.


We can provide a wide variety of solutions tailored specifically to your site and install them with minimal disruption.


To help take care of your investment, we provide a maintenance and repair service tailored to your specific requirements and budget.

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